ASTR 1102 Final Exam Practice – Cumulative Questions and
Answers | Louisiana State University
Where does hydrostatic equilibrium exist in the Sun?
a.
in the outer layers of the atmosphere, where most of the visible
light is produced
b.
only in the core, where energy production via fusion can balance
gravity
c.
only in the photosphere
d.
just outside the core, where heat from nuclear fusion is transported
outward
e.
throughout the Sun's interior - ANSWER >>>>>e.
throughout the Sun's interior
The net effect of the proton-proton chain is that four hydrogen
nuclei are converted to one helium nucleus and ________ are
released.
a.
visible wavelength photons
b.
X-ray photons, electrons, and neutrinos
c.
ultraviolet (UV) photons and neutrinos
d.
gamma-ray photons, positrons, and neutrinos
e.
infrared photons and positrons - ANSWER >>>>>d.
,gamma-ray photons, positrons, and neutrinos
Stars are made mostly of
a.
oxygen.
b.
nitrogen.
c.
helium.
d.
hydrogen.
e.
carbon. - ANSWER >>>>>d.
hydrogen
What do astronomers mean when they say that the Sun makes
energy by "hydrogen burning"?
a.
The Sun is fusing hydrogen into helium and releasing energy.
b.
The Sun is chemically combusting hydrogen in a fire and releasing
energy.
c.
The Sun is fusing hydrogen into uranium and releasing energy.
d.
The Sun is accumulating hydrogen from the solar wind and
releasing energy.
e.
The Sun is creating hydrogen at very high temperatures. - ANSWER
>>>>>a.
The Sun is fusing hydrogen into helium and releasing energy.
,The average distance between Earth and the Sun is 1.5 × 1011 m.
Light travels at 3 × 108 m/s. Therefore, light from the Sun takes
approximately ________ to reach Earth.
a.
8 years
b.
8 seconds
c.
8 hours
d.
8 minutes
e.
8 days - ANSWER >>>>>d.
8 minutes
Density, temperature, and pressure increase as you move inward in
the interior of the Sun. This means that the weight of the star
pushing inward at a given radius ________ as you move toward the
core.
a.
stays the same
b.
There is not enough information to ANSWER .
c.
increases and then decreases
d.
decreases
e.
increases - ANSWER >>>>>e.
increases
A light-year is a unit commonly used in astronomy as a measure of
, a.
acceleration.
b.
distance.
c.
time.
d.
mass.
e.
speed. - ANSWER >>>>>b.
distance.
If the Sun were not currently in hydrostatic equilibrium, we would
see
a.
more energetic solar flares.
b.
the Sun's luminosity increasing or decreasing.
c.
a vastly different number of neutrinos than we currently detect.
d.
more sunspots at all times.
e.
the Sun's radius increasing or decreasing. - ANSWER >>>>>e.
the Sun's radius increasing or decreasing.
Milky Way is the name of
a.
the galaxy in which we live.
b.
our Solar System.
c.
the local group of galaxies that we are in.
Answers | Louisiana State University
Where does hydrostatic equilibrium exist in the Sun?
a.
in the outer layers of the atmosphere, where most of the visible
light is produced
b.
only in the core, where energy production via fusion can balance
gravity
c.
only in the photosphere
d.
just outside the core, where heat from nuclear fusion is transported
outward
e.
throughout the Sun's interior - ANSWER >>>>>e.
throughout the Sun's interior
The net effect of the proton-proton chain is that four hydrogen
nuclei are converted to one helium nucleus and ________ are
released.
a.
visible wavelength photons
b.
X-ray photons, electrons, and neutrinos
c.
ultraviolet (UV) photons and neutrinos
d.
gamma-ray photons, positrons, and neutrinos
e.
infrared photons and positrons - ANSWER >>>>>d.
,gamma-ray photons, positrons, and neutrinos
Stars are made mostly of
a.
oxygen.
b.
nitrogen.
c.
helium.
d.
hydrogen.
e.
carbon. - ANSWER >>>>>d.
hydrogen
What do astronomers mean when they say that the Sun makes
energy by "hydrogen burning"?
a.
The Sun is fusing hydrogen into helium and releasing energy.
b.
The Sun is chemically combusting hydrogen in a fire and releasing
energy.
c.
The Sun is fusing hydrogen into uranium and releasing energy.
d.
The Sun is accumulating hydrogen from the solar wind and
releasing energy.
e.
The Sun is creating hydrogen at very high temperatures. - ANSWER
>>>>>a.
The Sun is fusing hydrogen into helium and releasing energy.
,The average distance between Earth and the Sun is 1.5 × 1011 m.
Light travels at 3 × 108 m/s. Therefore, light from the Sun takes
approximately ________ to reach Earth.
a.
8 years
b.
8 seconds
c.
8 hours
d.
8 minutes
e.
8 days - ANSWER >>>>>d.
8 minutes
Density, temperature, and pressure increase as you move inward in
the interior of the Sun. This means that the weight of the star
pushing inward at a given radius ________ as you move toward the
core.
a.
stays the same
b.
There is not enough information to ANSWER .
c.
increases and then decreases
d.
decreases
e.
increases - ANSWER >>>>>e.
increases
A light-year is a unit commonly used in astronomy as a measure of
, a.
acceleration.
b.
distance.
c.
time.
d.
mass.
e.
speed. - ANSWER >>>>>b.
distance.
If the Sun were not currently in hydrostatic equilibrium, we would
see
a.
more energetic solar flares.
b.
the Sun's luminosity increasing or decreasing.
c.
a vastly different number of neutrinos than we currently detect.
d.
more sunspots at all times.
e.
the Sun's radius increasing or decreasing. - ANSWER >>>>>e.
the Sun's radius increasing or decreasing.
Milky Way is the name of
a.
the galaxy in which we live.
b.
our Solar System.
c.
the local group of galaxies that we are in.
